Kodak Carousel projector question (850H)

[DanK]

I have a Kodak Carousel projector, model 850H, from the early 1980's
(more or less), with a damaged resistor that I am trying to identify.

Specifically, when opening up the projector, I saw that there is a
large resistor sitting under the fan. This is a ceramic covered
resistor, an inch and a half long, a quarter inch in diameter (i.e.
big). The ceramic coating has cracked off the resistor, exposing the
coiled wire inside. My search on the web has told me that this is a
dropping resistor, for when you switch the projection lamp to "low". I
found the Kodak part number (191985) at micro-tools.com. It was in
Kodak's part list, but with no further details on it.

I would like to replace this resistor, but need the specs on it. They
were printed on the resistor, but I can't read it, since the ceramic
coating it was printed on has fallen apart. Can anyone help me with
this? If I know the resistance and wattage, and rated voltage, I
should be able to replace it easily enough.

Other question:
Would it be a problem (either in terms of operation or safety) to use
the projector with this damaged resistor?

Thanks for any help!
DanK

 

[gb]

I have a Kodak Carousel projector, model 850H, from the early 1980's
(more or less), with a damaged resistor that I am trying to identify.

Specifically, when opening up the projector, I saw that there is a
large resistor sitting under the fan. This is a ceramic covered
resistor, an inch and a half long, a quarter inch in diameter (i.e.
big). The ceramic coating has cracked off the resistor, exposing the
coiled wire inside. My search on the web has told me that this is a
dropping resistor, for when you switch the projection lamp to "low". I
found the Kodak part number (191985) at micro-tools.com. It was in
Kodak's part list, but with no further details on it.

I would like to replace this resistor, but need the specs on it. They
were printed on the resistor, but I can't read it, since the ceramic
coating it was printed on has fallen apart. Can anyone help me with
this? If I know the resistance and wattage, and rated voltage, I
should be able to replace it easily enough.

Start with Electronics/Electrical 101
a drpping resistro is dropping the actual voltage on the projector lamp.

Do you have a VOM or DVM ??
If the resistor has not been damdged (other than ceramic coating) -- you may
get a reasonable resistance rating (in ohms) to start with. From description
sounds like a 10 or 25 watt rated resistor.

Other question:
Would it be a problem (either in terms of operation or safety) to use
the projector with this damaged resistor?

No, I would NOT operate projector with this damaged (exposed) resistor.
Some desldering wick and a good bench soldering station - you shoudl have
that removed in less than 1 minute.

IF these 2 steps above are beyond your skill set -- consult a quality
appliance or electric technician (HV AC inside).

gb

 

[Ken Layton]

Ebay manual seller, "nikondave" sells excellent manuals for this
projector as well as many other brands/models.

This series of projector also used what's called a "trans-motor". It's
a blower motor with extra windings in it used as a power transformer.
This "trans-motor" provides the low voltage ac to the little circuit
boards inside the projector.

Kodak discontinued all parts for this series projector and K.M.R.
Electronics (www.kmr.com) is now the only source for parts for this
series of slide projectors.

 

[Ken Layton]

Oh, by the way, the Carousel series was manufactured from 1969 through
1978 (or so).

Some of the folks on the www.film-center.com forums do slide projector
repairs.

 

[Fred McKenzie]

I have a Kodak Carousel projector, model 850H, from the early 1980's
(more or less), with a damaged resistor that I am trying to identify.

Specifically, when opening up the projector, I saw that there is a
large resistor sitting under the fan. This is a ceramic covered
resistor, an inch and a half long, a quarter inch in diameter (i.e.
big). The ceramic coating has cracked off the resistor, exposing the
coiled wire inside. My search on the web has told me that this is a
dropping resistor, for when you switch the projection lamp to "low". I
found the Kodak part number (191985) at micro-tools.com. It was in
Kodak's part list, but with no further details on it.

I would like to replace this resistor, but need the specs on it. They
were printed on the resistor, but I can't read it, since the ceramic
coating it was printed on has fallen apart. Can anyone help me with
this? If I know the resistance and wattage, and rated voltage, I
should be able to replace it easily enough.

Other question:
Would it be a problem (either in terms of operation or safety) to use
the projector with this damaged resistor?

DanK-

From what you say, the projector is functioning with the resistor.
Therefore, you should be able to measure it to determine resistance (power
disconnected, of course!) and measure voltage across it when it is doing
its job. Voltage squared divided by resistance is the power it is
burning. Double that for a safety factor, and you have a good estimate of
its specs.

Ideally you should replace the resistor. Practically, it will most likely
continue to function with no ill effects. It would not be safe to touch
the bare coiled wire, but neither would it be safe to touch the wires on
the ends of the resistor while power is applied. Anything that might
inadvertantly make contact with the coiled wire, might also touch the
connecting wires with similar results.

Fred

 

[atomk]

Hi Fred

Don't worry about the ceramic coating flaking off the power resistor.
As long as the electrical part is functioning, it will work just fine
The ceramic coating provides some degree of electrical insulation t
prevent getting a shock when touching it but with the projecto
bottom cover in place, there's no shock hazard
If you'd like to replace it anyway, the value is 5 ohms at 25watts.
You can email me ([email protected]) for source and price info

 

[Ken Weitzel]

Hi Fred,

Don't worry about the ceramic coating flaking off the power resistor.
As long as the electrical part is functioning, it will work just fine.
The ceramic coating provides some degree of electrical insulation to
prevent getting a shock when touching it but with the projector
bottom cover in place, there's no shock hazard.
If you'd like to replace it anyway, the value is 5 ohms at 25watts.
You can email me ([email protected]) for source and price info.

Hi Atomk...

I respectfully suggest replacing it. That resistor sits
in the air flow of the fan, and I suspect it's rated
dependent on that air flow.

Concern would be that if the fan should stop that the resistor
would overheat, at which time I'd like the flame resistant
ceramic to be there

Take care.

Ken